63934657818 has 16 divisors (see below), whose sum is σ = 130988079936. Its totient is φ = 20791758560.

The previous prime is 63934657811. The next prime is 63934657819. The reversal of 63934657818 is 81875643936.

It is a super-2 number, since 2×63934657818² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63934657811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129948246 + ... + 129948737.

It is an arithmetic number, because the mean of its divisors is an integer number (8186754996).

Almost surely, 2^63934657818 is an apocalyptic number.

63934657818 is an abundant number, since it is smaller than the sum of its proper divisors (67053422118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63934657818 is a wasteful number, since it uses less digits than its factorization.

63934657818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259897029.

The product of its digits is 26127360, while the sum is 60.

The spelling of 63934657818 in words is "sixty-three billion, nine hundred thirty-four million, six hundred fifty-seven thousand, eight hundred eighteen".